This past February, thousands of ESXi servers were affected by a new ransomware attack (called ESXiARGS) that targeted the servers through a security flaw (tracked as CVE-2021-21972, CVE-2021-21973 and CVE-2021-21974), which is caused by a …
Zimbra: /snap/core at 100% – Disable Disk Space Monitoring for Loop Devices
I recently logged into the Admin mail account of a Zimbra mail server I manage to see if there was anything noticeable to look at. It’s not an account I log in much, since it …
Zimbra – Upgrading SSL certificates after Let’s Encrypt DST Root CA X3 expiration
On September 30, 2021, the Let’s Encrypt DST Root CA X3 certificate expired. This certificate was used to sign all SSL certificates generated by Let’s Encrypt. To avoid serious problems, Let’s Encrypt created a new …
WordPress – error:1408F10B on API calls.
I recently set up a new server for a WordPress website. I prepared it following the same process as always: Ubuntu 20.04 as the operating system, Nginx as the web server, PHP 7.4, and MariaDB …
Migrate accounts from Kerio Connect to Zimbra Collaboration with ImapSync
In previous posts we saw what Zimbra Collaboration is, which prerequisites are necessary for its installation, how to install and configure DNSMasq and finally, how to install Zimbra. Now we’re going to see how to …
“User unknown in virtual alias table” Error in Postfix and Virtualmin
I recently came accross a strange issue with Postfix and Virtualmin on every website hosted on my server when someone tried to send a mail using a contact form. The websites stated that the email …
Zimbra Collaboration 8.6 – DNSMasq
In the previous articles we saw what Zimbra is and how to prepare the server with the necessary prerequisites to install it. We will now finish with these prerequisites by installing and configuring DNSMasq on …
Zimbra Collaboration 8.6 – Prerequisites
As I explained in my first entry about Zimbra Collaboration, I’m going to dedicate a few articles to explain its prerequisites, installation and configuration, and to continue with this series, I’m going to dedicate this part …